856-857 / 3107
E(1) = 1 mm = s+r(1)
r(1)=-7
s=8
(too) simple off-line protocol:
measure day 1, correct on days 2,3,…
without new measurements, what to do in following fractions with the
set-up error measured on day 1?
-14 -12 -10
14
-8 -6 -4 -2 0 2 4 6 8 10 12
a small measured set-up error does
NOT
imply a small problem
A SINGLE MEASUREMENT (IN THE FIRST FRACTION) CANNOT BE
USED FOR SET-UP CORRECTIONS IN FOLLOWING FRACTIONS
(if it is huge, then find out reason, do not simply correct)